Add body class when loaded (#50)

README.md

@@ -16,10 +16,11 @@ in situations in which the `:focus-ring` pseudo-selector should match.
 
 We suggest that users
 selectively disable the default focus style
-by selecting for the case when `.focus-ring` is _not_ applied:
+by selecting for the case when the polyfill is loaded
+and `.focus-ring` is _not_ applied to the element:
 
 ```html
-:focus:not(.focus-ring) {
+.focus-ring-enabled :focus:not(.focus-ring) {
     outline-width: 0;
 }
 ```
@@ -134,9 +135,12 @@ The tiny
 provides a prototype intended to achieve the goals we are proposing
 with technology that exists today
 in order for developers to be able to try it out, understand it and provide feedback.
-It simply sets a `.focus-ring` class on the active element
+It simply sets a `.focus-ring-enabled` class to the body element
+to provide a way to disable focus styles only when the polyfill is loaded.
+It also sets a `.focus-ring` class on the active element
 if the script determines that the keyboard is being used.
 This attribute is removed on any `blur` event.
+
 This allows authors to write rules
 which show a focus style only when it would be relevant to the user.
 Note that the prototype does not match the proposed API -

dist/focus-ring.js

@@ -288,15 +288,15 @@ function init() {
    * to which it was previously applied.
    */
   function onWindowFocus() {
-    if (document.activeElement == elWithFocusRing) {
+    if (document.activeElement == elWithFocusRing)
       addFocusRingClass(elWithFocusRing);
-      elWithFocusRing = null;
-    }
+
+    elWithFocusRing = null;
   }
 
   /**
-   * When the window regains focus, restore the focus-ring class to the element
-   * to which it was previously applied.
+   * When switching windows, keep track of the focused element if it has a
+   * focus-ring class.
    */
   function onWindowBlur() {
     if (document.activeElement.classList.contains('focus-ring')) {
@@ -312,6 +312,8 @@ function init() {
   document.addEventListener('blur', onBlur, true);
   window.addEventListener('focus', onWindowFocus, true);
   window.addEventListener('blur', onWindowBlur, true);
+
+  document.body.classList.add('focus-ring-enabled');
 }
 
 /**

src/focus-ring.js

@@ -142,6 +142,8 @@ function init() {
   document.addEventListener('blur', onBlur, true);
   window.addEventListener('focus', onWindowFocus, true);
   window.addEventListener('blur', onWindowBlur, true);
+
+  document.body.classList.add('focus-ring-enabled');
 }
 
 /**